Black Ruthenium Tank Plating Solution (UK and EU only)

£59.67£194.38 + VAT

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This Black Ruthenium Tank Plating Solution plates a true black layer on 18ct gold, sterling and britannia silver. A good alternative to rhodium plating solution, as it’s selenium and arsenic free.

Orders outside UK and EU

This plating solution cannot be purchased and shipped outside the UK and the EU because it’s part of our range of plating solutions which are regulated for transport.


HS Code: 3824 99 70

Plates a substantial blue black layer of black ruthenium on sterling and Britannia silver. A less hazardous alternative to black rhodium, as it doesn’t contain selenium or arsenic. A good alternative to other sulphur-containing blackening agents. Please read ‘Tech Specs’ for more guidance. For guidance on plating times, please click HERE for our Black Ruthenium Tank Plating Calculator.

To plate using our Black Ruthenium Tank Plating Solution, we recommend you purchase the same kit that’s used for our rhodium tank plating solution. To view this, please click HERE.

Black Ruthenium Calculator

Operating Parameters

Ruthenium concentration 5 g/l
Plating Factor 0.015 A/cm2
Plating rate (PF: 0.015) 0.1 µm/min (see notes below)
Voltage 1-3 volts
pH <1.0
Temperature 60-70 °C
Anode Platinised titanium or MMO (mesh)
Ruthenium content in plate 99.9
Blackness L* (CIE Lab measure) 48 – 55 (See notes)
Agitation Vigourous stirring
Hardness ~800 Hv
Stress (tensile) Very high (brittle)
Special storage requirements None
Shelf life Over two years
Health and Safety classification Irritant
Special considerations None
Transport (UN number) 2796



  • Plating up to 0.3 micron on sterling silver and 18-carat gold possible.
  • Do not plate over 0.1 micron over 24 carat gold or fine (0.999) silver. This includes silver and gold plated layers.
  • If plating over 24 carat gold or fine silver, flash with an 18 carat gold layer first in order to plate over 0.1 micron.
  • Plating over copper or its alloys (brass) requires a barrier layer of 0.5 micron minimum of nickel then plate in 18 carat gold.
  • Blackening effect decreases with an increase in thickness. Maximum blackness (L* < 47) is obtained below 0.2 microns.
  • The ability to plate in recesses decreases as the amount of blackening agent is increased.
  • Plating rate decreases as the amount of blackening agent is increased.

Some items are regulated for transport and can only be delivered to destinations in the UK and countries within the EU. Alternative or substitute products are detailed in the ‘Description’ tab of this tabbed panel or under Related Items below this tabbed panel.
For all price quotations for deliveries, please add your items to our shopping cart. You will be able to see the shipping costs by clicking on the ‘Calculate shipping’ button in the cart and before checking out.